BIO assignment

In the following diagrams, draw out ONLY the chromosomes in the cells going through the phases of Mitosis and Meiosis. IMPORTANT- Each cell will start off with 4 total chromosomes. To aid in your understanding, please draw them as homologous pairs; one set will be 2 large Xs, the other will be 2 small Xs. Then, answer the questions that follow.

1. Use the letter A on the diagrams above to indicate where CROSSOVER occurs. Circle one of the following (Mitosis, Meiosis, or both).

2. Use the letter B on the diagrams above to indicate a phase where the nuclear membrane dissolves. Circle one of the following (Mitosis, Meiosis, or both).

3. Use the letter C on the diagrams above to indicate a phase in which cytokinesis occurs. Circle one of the following (Mitosis, Meiosis, or both).

4. Use the letter D on the diagrams above to indicate a phase in which sister chromatids are splitting. Circle one of the following (Mitosis, Meiosis, or both).

5. Use the letter E on the diagrams above to indicate a phase in which homologous pairs are splitting. Circle one of the following (Mitosis, Meiosis, or both).

6. Use the letter F on the diagrams above to indicate cleavage furrow. Circle one of the following (Mitosis, Meiosis, or both).

7. Produces GAMETES- Circle one of the following (Mitosis, Meiosis, or both).

8. Produces clone daughter cells- Circle one of the following (Mitosis, Meiosis, or both).

9. Results in genetic variation- Circle one of the following (Mitosis, Meiosis, or both).

10. Has duplicated chromosomes- Circle one of the following (Mitosis, Meiosis, or both).

11. Produces haploid cells - Circle one of the following (Mitosis, Meiosis, or both).

Genetics- Monohybrid crosses

1. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation?

2. In tomatoes, red fruit (R) is dominant over yellow fruit (r). A plant that is homozygous for red fruit is crossed with a plant that has yellow fruit. What would be the genotypes and phenotypes of the P1 and F1 generations?

P1

F1

3. In humans, being a tongue roller (R) is dominant over non-roller (r). A man who is a non-roller marries a woman who is heterozygous for tongue rolling. What is the probability of this couple having a child who is a tongue roller? ________

4. A woman who is a carrier (heterozygous) for Cystic Fibrosis marries a man who has Cystic Fibrosis, a recessive disease. What are the genotypes? What is the probability that their children will have the disease? What is the probability that their children will not have the disease?

5. A woman who is a carrier (heterozygous) for Huntington’s Disease, which is a dominant disease, marries a man who is also a carrier for the disease. What are the genotypes? What is the probability that their children will have the disease? What is the probability that their children will not have the disease? Show a Punnett square!

Genetics- Sex-linked traits

Hemophilia is a recessive sex-linked disease carried on the X chromosome in humans.

1. Write the genotype of a woman who does not have hemophilia. ______

2. Write the genotype of a woman with hemophilia. ________

3. Write the genotype of a woman who is a carrier (heterozygous) for hemophilia. ____________ 4. Write the genotype of a man who has hemophilia. _________

5. Write the genotype of a man who does not have hemophilia. __________

6. A woman who is heterozygous for hemophilia marries a normal male. What are the possible phenotypes of their children?

7. A woman who is a carrier for hemophilia marries a man with hemophilia. Could any of their children have hemophilia? If so, would the child be male or female?

8. A woman with hemophilia marries a man who does not have hemophilia. What are the possible phenotypes of their children?

9. A woman without hemophilia marries a man with hemophilia. They have a daughter with hemophilia. What is the genotype of the mother and father?

Colorblindness is a sex-linked recessive trait in humans.

1. Write the genotype of a woman who is not colorblind. ______

2. Write the genotype of a woman who is colorblind. ________

3. Write the genotype of a woman who is a carrier (heterozygous) for colorblindness. ____________

4. Write the genotype of a man who is colorblind. _________

5. Write the genotype of a man who is not colorblind. __________

6. A colorblind man marries a female who is a carrier for colorblindness. What is the probability that they will have a child who is colorblind?

7. A colorblind male marries a female who is not colorblind (homozygous). What are the possible phenotypes of their children?